Yeah I guess it reduces instruction cache misses, but then other codepaths are likely to get more misses.
Does it do anything smarter? Marek On Thu., Feb. 13, 2020, 17:52 Dave Airlie, <airl...@gmail.com> wrote: > On Fri, 14 Feb 2020 at 08:22, Marek Olšák <mar...@gmail.com> wrote: > > > > I wonder what PGO really does other than placing likely/unlikely. > > With LTO it can do a lot more, like grouping hot functions into closer > regions so they avoid TLB misses and faults etc. > > Dave. >
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